欧美bbbwbbbw肥妇,免费乱码人妻系列日韩,一级黄片

Java操作IO對象流進行數(shù)據(jù)的讀寫

 更新時間：2021年07月01日 10:35:00   作者：幻影寒狼  
這篇文章主要介紹了Java操作IO對象流進行數(shù)據(jù)的讀寫,本文通過例子逐步介紹了java如何操作IO流,和文字解析,需要的朋友可以參考下

對象的讀寫
使用ObjectInputStream和ObjectOutputStream讀寫對象(序列化與反序列化)。

只有字節(jié)流沒有字符流

  1. .類必須實現(xiàn)Serializable接口
  2. 給類加個序列化編號，給類定義一個標記，新的修改后的類還可以操作曾經序列化的對象
  3. 靜態(tài)是不能被序列化的，序列化只能對堆中的進行序列化 ，不能對“方法區(qū)”中的進行序列化
  4. 不需要序列化的字段前加 transient

小例子：

先創(chuàng)建一個Dog對象并序列化:

package com.uwo9.test03;
 
import java.io.Serializable;
 
public class Dog implements Serializable {
	private static final long serialVersionUID = 2809685095868158625L;
	String name;
	String color;
}

再創(chuàng)建一個Student對象并序列化：

package com.uwo9.test03;
 
import java.io.Serializable;
 
public class Student implements Serializable {
	private static final long serialVersionUID = 9078616504949971001L;
	static public  String schoolName;
	private transient String name;
	private transient int age;
	private double score;
	private Dog dog;
	public Student() {
		super();
	}
	public Student(String name, int age, double score, Dog dog) {
		super();
		this.name = name;
		this.age = age;
		this.score = score;
		this.dog = dog;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public double getScore() {
		return score;
	}
	public void setScore(double score) {
		this.score = score;
	}
	@Override
	public String toString() {
		return "Student [name=" + name + ", age=" + age + ", score=" + score + "]";
	}
 
}

將數(shù)據(jù)寫入對象流并存入文件

package com.uwo9.test03;
 
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Collections;
 
public class Test01 {
 
	public static void main(String[] args) {
		Dog dog = new Dog();
		dog.name = "大黃";
		dog.color = "Yellow";
		Student student1 = new Student("學生1", 18, 99,dog);
		Student student2 = new Student("學生2", 19, 99,dog);
		Student student3 = new Student("學生3", 20, 99,dog);
		Student.schoolName = "某某大學";
		File file = new File("E:/Temp/Test1.txt");
		ObjectOutputStream oos = null;
		try {
			oos = new ObjectOutputStream(new FileOutputStream(file));
			//oos.writeObject(student);
			ArrayList<Student> arrayList = new ArrayList<>();
			Collections.addAll(arrayList, student1,student2,student3);
			oos.writeObject(arrayList);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			try {
				oos.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		
	}
 
}

從指定文件中讀取對象

package com.uwo9.test03;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;
 
public class Test02 {
 
	public static void main(String[] args) {
		// 從指定的文件中讀取對象
		File file = new File("E:/Temp/Test1.txt");
		ObjectInputStream ois=null;
		try {
			ois = new ObjectInputStream(new FileInputStream(file));
			// 讀取對象
			// Student stu = (Student)ois.readObject();
			// System.out.println("讀取到的數(shù)據(jù)為:"+stu);
			@SuppressWarnings("unchecked")
			ArrayList<Student> arrayList = (ArrayList<Student>) ois.readObject();
			for (Student student : arrayList) {
				System.out.println(student);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}finally {
			try {
				ois.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
 
	}
 
}

到此這篇關于Java操作IO對象流進行數(shù)據(jù)的讀寫的文章就介紹到這了,更多相關Java IO流進行數(shù)據(jù)的讀寫內容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！

相關文章

最新評論